tailieunhanh - Laser Welding Part 6

Tham khảo tài liệu 'laser welding part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 94 Laser Welding stationary conditions during welding. Some trial tests on STJ specimens were performed to verify if the main geometrical parameters of weld sections were the same of those achieved in the preliminary analysis on the base materials. Weld geometry was characterised by the penetration depth and width equal to and mm quite equal to those measured on the base materials. The small variations between results were inputted to the laser beam power fluctuation specimen geometry plate vs. bar as well as materials compositions monomaterial vs. tri-materials . The following tests on STJs were performed with the laser beam power equal to kW and travel speed set to or m min respectively for aluminium or steel top surface. The specimen LPBAL1 LPBAL2 and LPBAL3 were realised by machining the aluminium side Table 11 . The distance d between the melt zone and the Al Fe was planned to and mm assuming that the penetration depth remained constant to mm. Table 11 also reports cut section details of the weld fused area and geometrical parameters such as the penetration depth h and width r. In particular these two parameters decreased with the reduction of the distance d in spite of the thermal load on the top surface was the same for all specimens. Specimen LPBAL1 LBPBAL2 LBPBAL3 Geometry Results Section r mm h mm r mm h mm r mm h mm Parameters Table 11. Tests on STJs - Aluminium side. Laser welding of aluminium-steel clad materials for naval applications 95 Possible justifications of this trend were the lower conductivity of steel that reduced the heat transmission at bond interface as well as in the steel region and the smaller aluminium thickness that lowered the possibility of the laser-induced heat to quickly went away from the weld fused area. The decrease of the main weld parameters become more evident by comparing the as-clad specimen with LPBAL3. The difference of the penetration depth between these two

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